Revolving door speed control



4, 1936. T. M. HAGENBOOK 2,029,318

REVOLVING DOOR SPEED CONTROL Original Filed Sept. 10, 17932 4 Sheets-Sheet 1 T. M. HAGENBOOK REVOLVING DOOR SPEED CONTROL Feb. 4, 4936. 2,029,318

Original Filed Sept. l0, 1952 4 Sheets-Sheet 2 IN V EN T OR.

Feb. 4, 1936., T. M. HAGNBK 2,029,318

REvoLvING DooR SPEED coNTRoL original Filed sept. 1o, 1952 4 sheets-sheet 3 f 65mm 9m aeagwwz,

Feb. 4, 1936. T, M. HAGENBOQK v029,318

REVOLVING DOOR SPEED CONTROL Original Filed Sept. 10, 1932 4 Sheets-Sheet 4 L nun lm INVEN TOR.

@Ms QT. ijagw/oo,

Patented Feb. 4, 1936 FFHCE REVOLVING DOOR SPEED CONTROL Thurloe M. Hagenbook,

Evansville, Ind., assignor,

by mesne assignments, to International Door Company, Evansville, Ind., a corporation of Illinois Claims'.

'My invention relates broadly to speed control mechanism and more particularly to the structure of a speed control adapted for installation 1n connection with revolving doors.

This application is a division of my application Serial No. 632,627, filed September 10, 1932, entitled Revolving door speed control.

'One of the objectsof my invention is to providev a construction of speed control device for attachment to revolving doors of various types for controlling the speed of revolution of the reolving door and increasing the safety of operaion.

Another object of my invention is to provide a simplified construction of speed co-ntrol for revolving doors which may be inexpensively manufactured on a quantity production basis and utilized for precision .operation in the control of revolving doors of various makes.

Still another object of my invention is to provide a construction of speed control mechanisrn in which a drum type friction brake is operated by the movement of a centrifugal actuater as the speed of the rotary shaft to which thecontrol mechanism connects is increased.

A further object of my invention is to provide a construction of centrifugal governor for revolving doors wherein substantial load is added tothe door under conditions where the rate of speed at which the door is operated increases beyond a predetermined value.

A still further object of my invention is to provide an attachment capable of engaging the upper pintle of the revolving door and establish a geared connection with a centrifugal governor and friction brake device for controlling the speed of operation of the revolving door within predetermined limits.

Another object of my invention is to provide a construction of centrifugally operated clutch for a governor for revolving doors having means for rendering a friction brake eiective when the speed of rotation of the revolving door tends to exceed a predetermined rate.

Other and further objects of my invention reside in the construction of friction brake revolving door speed control as set forth more fully in the specicat-ion hereinafter following by reierence to the accompanying drawings, in which:

Figure 1 is a cross-sectional view taken through the revolwing door speed control of my invention with some of the parts illustrated in side elevation; Fig. 2 is a side elevational view of the revolving door speed control showing the supporting rails constituting the trolleys and the socket bearing for the upper portion of the revolving door illustrated in cross-section and looking in the direction oi arrow A of Fig. 1; Fig. 3 is a horizontal sectional view of the revolving door speed control device of my invention takenon line 3 3 of Fig. 1; Fig. 4 is a horizontal sectional View taken through the speed control on line 4 4 of Fig. 1 on an enlarged scale; Fig. 5 is a cross-sectional view taken through the speed control on line 5 5 of Fig. 1; Fig. 6 is a cross-sectional view taken through the speed control on line 6 6 of Fig. 1; Fig. 'l is a side elevation of the ratchet mechanism employed in connection with the centrifugal governor mechanism in the revolving door speed control device of my invention; and Fig. 8 is a schematic view showing the manner in which the revolving door is assembled for connection with the speed control device.

Referring particularly to the drawings, reference character I designates the wings of the revolving doors arranged to revolve around the central axis 2 immediately below the rails 3 constituting the trolley support for the revolving doors. The wings l of the revolving doors are suspended from the rails 3 by means of roller members l journaled on the ends of shaft 5 connected through support E with member 'l which engages the upper rail 8 of the revolving doors. The upper l rail 8 is provided with socket member 9 within which annular member IU is seated for housing the annular members I I and I2 having ball races for guiding ball bearings lli therebetween. The annular member l0 has upwardly projecting cylindrical walls Illa and Mib between which, the annular members I I and l2 are confined and into which the annular member I6 projects and rests upon the upper portion of the annular ring member I2. The member I6 is screw threaded at I6a to receive the screw threaded end of the tubular member 2, as shown. The upper portion of member I6 is provided with a socket IBb into which there extends the cylindrical liner I1. The cylindrical liner I1 provides a socket which is adapted to receive the spring pressed pin I8. The spring pressed pin I8 is chamfered at IBa to permit ready insertion or removal of pin I8 from the socket formed interiorly of the liner I1. The pin i8 is mounted within a cylindrical guide I9 which projects from the lower plate forming part of the housing of the speed control device. The cylindrical guide I9 has a screw device 2| extending through one side thereof with a pin 22 from the end of the screw device projecting into a socket 23 in one side of the projectible pin I8 so that pin i8 is free toy move vertically against 40 members .'42,

"65 rthe aperture '55.

the resistance offered by coil spring 3U. It will be observed that the upper portion of annular member i6 has a beveled surface represented at I 6c which enables the revolving door assembly to be interconnected with the speed control governor mechanism by rolling the revolving doors on the trollies to a position where the beveled surface contacts with the charnfered edge |801.` of pinV i8, thereby raising pin i8 and allowing the pin to 10 drop into the socket formed bytheliner Vi.. .The revolving door structure is thus centered with respect to the governor mechanism, and the gear teeth |612 on the periphery of the annular' member l5 are brought into mesh with the gear teeth l5 on gear 32. Gear 32 is carried by stub shaft 33 which is journaled in ball bearings 34 and-35. Ball bearings 34 are mounted in races supported in plate 20. Ball bearings 35 are mounted inzraces supported in casting 35 which extends. in a` position substantially chordal to the casing within *.whichithe speed control mechanism is housed. 'I'heicasting 35 which is illustrated more clearly ginfFigs. '2 and 5, is secured to plate 2E! by means '.ofscrews v36a and is provided with downwardly 25r-depending lugs 3l through which set screws 38 pass and lengage rails 3 forming part of the `:stationary equipment of the revolving door. In forder to further mount the governor rigidlyr with respect to the stationary frame structurebeneath which the revolving door Vmoves, I provide the fcasting-39 beneath the governor housing and sub- -fstantially -chordal to the governor housing and .connected thereto through screw members 39a.

.The casting A39 has depending lugs 4E! through ,35 which the-'securing screws 4| pass, which screws grip rails 3 as represented in Fig. 6 thereby insuring a rigid mounting for the governor housing immediately above the rails 3.

The.transversely extending plate 20 has the cover-member 3| secured thereto by means of bolt The cover member 3| and plate f member.2ll :arerecessed as indicated at 3io and 1;.20a2 to. receive'roller bearing guide rings repre- `sented at-43 and 44 respectively. A stub shaft 45 i isrjournaled vertically through casing 3| and plate '2llbymeans of annular members 46 and 41 aligned ewithfrespect to the annular members 45 and 44 "byrmeans of conical shapedfroller bearings 48 nar-idz49, asshown. Shaft 45 is provided with gear 50 teeth'50 non the lowerf'projecting end thereof 55 thereby rotating shaft 33 in the' bearings 34 and '-35 and driving gear 5| which in turn drives verltical shaft 45 vthrough gear teeth "5D thereon. Shaft45 has a-sleeve 52 secured thereon con- `-centrically within the frame 53 of the friction A disc. The shaft-45 is diametricallyapertured for the `passage of pin^54. The aperture 55 in shaft "45 through whichy pin 54 extends iselongated ver- "ticallyzso that the frame 53 in the friction wheel is free to move vertically within limits offered by A coil spring 56 is disposed within the central socket of shaft 45 and exerts acontinuous force against pin 54 and the adjust- YLing screw head 5?. By'adjusting screw head 5l Ydownwardly against coil spring 56, the vertical thrust of the frame r53 of the friction wheel is resisted so thatthe load which is added to the Vrevolving doors at a predetermined rate of speed .may be accurately controlled. Tiie'friction wheel .53.has afriction face 58 secured thereto adapted 75 to be pressed'intol engagement with the friction fforce.

face 59 of the casing 3| for retarding the rotation of the revolving doors and holding the doors to the predetermined speed in accordance with the condition of centrifugal force which is established as the doors revolve. The sleeve 52, carried 5 by the frame of the friction wheel 53,? has clutch teeth 52a directed downwardly for normally engaging clutch teeth E@ projecting upwardly from ya hub 6| on rotatable disc 52. lIhe rotatable disc 62- has a plurality of. upstanding lugs 62a thereon 10 disposed in diametrically opposite positions on the disc 62 and serve as pivots for bell cranks 63. The bell cranks each carry weights 64 on the extremities thereof, .which weights are free to moveV in radial planes under the action of centrifugal 15 The Vbell cranks have pressure feet 65 on opposite extremities thereof which engage the lower face ofthe frame of the friction wheel 53. Underthe action of centrifugal force, the weights 54 move outwardly within the hollow interiorof 20 the housing 3| and operate :to -forceifriction wheel 53 upwardlyso that friction surface '58 vengages beveled surface 59 in housing 3| for grad- .getting Acaught between the doors and Wall, the 35 doors'will be quickly stopped thus avoiding injury to property and people. The brake acts very quickly where a person or object stops the'door and will prevent accidents Vwhich could occur if the Ybrake did not act'promptly. When the speed of the revolving door is reduced, the weight of the `friction wheel 53 and the force of spring 56 acting upon pin 54 is such as to restore the bell cranks to a position immediately adjacent the upper surface of rotatable disc 52, thus returning ,45 the weights 54 to a position in which changes in speed will'produce changes in angular position of the weights 54. The speed control may beadjusted for operation at selected rates of speed by adjustingA screw threaded member 51 against 50 spring 55 which bears against diametrically'extending rod 54, so that the frictional load will be rendered effective at a predetermined speed. The trolley mechanism operating upon the guide rails permits the doors to be moved over to theside o1'-,55 opening, thereby giving a free opening so that large objects may be taken through the doors. The trolley only carries the weight of the doors. When the doors must be moved out of central position, the ejector rod 65 is given a quick Vertical ce() movement by means of the projecting lever 61 extending through slot 58 in the vertically disposed tube 2. The ejector rod 65 passes through a bushing, as indicated at 5S, which is placed in the end of tube 2. Rod 65 has a diameter of api165 proximately 11g and a length terminating short of the pin i8. Rod 55 always terminates beneath pin i8 allowing the installation of the equipment on doors of different heights and permitting installations to be made on old doors now in uselm Upward movement of rod 66 forces pin I8 out of socket Il, enabling gear |612 to be disengaged from gear 32, so that the entire revolving door structure may be shifted on the trolley away from the speed control mechanism. 17.5

When it is desired to engage the speed con- `trol mechanism with the revolving door structure, the revolving doors are moved on the trolley mechanism to a position in which the pin I8 rides on beveled surface Hic of member I6 and after being depressed vertically, rops into the socket formed by sleeve Il, thereby maintaining the gears in mesh and enabling the speed control to directly function under control of the movement of the doors. In order to maintain the parts of the speed control in lubricating condition, I provide a port 'Il through shaft l5 which may be closed by any suitable oil cup or device, represented generally at 70, for supplying lubricant to the moving parts of the speed control.

It will be seen that under normal conditions, the rotatable disc 62, the frame 53 of the friction wheel and the rotatable shaft G5, rotate as a u nit through the clutch connection formed by teeth 52a and 6B. Under conditions of increase in speed, however, the load, due to the vertical movement of the friction wheel of which 53 forms a part, is increased as the coupling between rotatable disc 62 and shaft l5 is decreased, but the clutch teeth 60 and 52a are never disengaged. The loading of the doors will prevent racing through them. It is not intended for the speed control to exert a force great enough to cause the doors to collapse, but to add a load so as to discourage the Ydesire to race, thereby making the doors safe for everybody. The clutch is always engaged except when the door decelerates. When the door moves slower than the flywheel, the clutch partially disengages and the upper jaws rise.

It will be observed that rotatable disc 62 is weighted at its periphery so that, as a flywheel, it continues to revolve by release of the kinetic energy stored therein after the driving force on the doors has been released. Allowance is made in the action of the brake system to prevent sufcient movement of the revolving doors to permit injury to persons or objects caught between the ends of the door wings and the frame. The character of gripping action brought about by i the brake system is such, that a sufficiently rapid stopping action is obtainable to prevent injury to persons or objects. If the speed of rotation is increased beyond a safe value and the door comes to rest at the limit of the peak speed, the brake will automatically allow the door to be released and to be revolved freely.

The structure of my invention has been found to be highly practical in manufacture, production and operation, and while I have described my invention in certain preferred embodiments,

I desire that it be understood that modifications may be made and that no limitations upon my invention are intended other than are imposed by the scope of the appended claims.

What I claim as new and desire to secure by Letters Patent of the United States is as follows:

1. In a speed control for a rotary shaft, the combination with a shaft rotatably mounted in a vertical position, a gear device driven by the said shaft, a speed control casing supported in a fixed position above said shaft, a driven gear journaled in said speed control casing and adapted to be meshed with the drive gear connected with the shaft, a plurality of control means within said speed control casing operated by said driven gear, and a friction brake within said speed control casing automatically and selectively actuated by said plurality of control means for applying a retarding load'to the rotary shaft.

2. A speed control for a rotary shaft comprising in combination with a frame structure, a shaft rotatably mounted beneath said frame structure, a driving gear connected with said shaft, a speed control casing mounted in fixed relation to said frame structure, a plurality of actuators rotatably mounted in said casing, a friction brake disposed in said casing and operative under control of said actuators, a driven gear meshing with said driving gear and journaled with respect to said casing for imparting rotary movement to said actuators for imparting increase in load to the rotary shaft as the speed of rotation thereof varies excessively.

3. A speed control for a rotary shaft comprising in combination with a frame structure, a shaft mounted for rotation with respect to said frame structure, a speed control casing supported in fixed relation to said frame structure, a rotary element within said speed control casing including actuating devices and a friction brake, and means interconnecting said rotatable element with the rotary shaft for loading said rotary shaft under control of said friction brake as said actuating devices are selectively effective depending upon the nature of the variation in the speed of the shaft.

4. In a speed control for a rotary shaft, a frame structure, a rotary shaft mounted for rotation with respect to said frame structure, a driving gear connected with said shaft, a speed control casing supported in fixed relation to said frame structure over said shaft, a central shaft journaled in said speed control casing, a driven gear journaled in said casing for establishing a driving connection between said driving gear and said central shaft, a flywheel disposed concentrically around said shaft within said casing, a friction wheel in said casing slidably connected with said shaft, and means interconnecting said friction wheel and said flywheel for causing said flywheel to raise said friction wheel into frictional engagement with a part of said casing when the rotary shaft is sharply decelerated, thereby instantly stopping the rotary shaft by the friction braking thus produced.

5. In a speed control for a rotary shaft, a frame structure, the rotary shaft rotatably mounted with respect to said frame structure, a driving gear connected with said shaft, a speed control casing supported in xed relation to said frame structure, a rotatable shaft journaled in said casing, a driven gear journaled in said casing for establishing a driving connection between said driving gear and said rotatable shaft journaled in said casing, a flywheel journaled about said rotatable shaft, a friction wheel connected with said rotatable shaft, a clutch disposed between said flywheel and said friction wheel and rotatably engaged for rotating said friction wheel and ilywheel as a unit for all speeds of operation of the rotary shaft below a predetermined speed, and centrifugal means carried by said flywheel for longitudinally displacing said friction wheel with respect to said rotatable shaft on conditions of excess speed of the rotary shaft for forcing said friction wheel into frictional engagement with a part of said casing for applying a load to the rotary shaft.

6. In a speed control for a rotary shaft, a frame structure, the rotary shaft rotatably mounted with respect to said frame structure, a driving gear connected with said shaft, a speed control casing supported in fixed relation to said frame structure, a rotatably driven shaft journaled in `said casing, a driven gear journaled in said casing forestablishing a driving connection between said 'drivinggear and said driven shaft journaled in said casing, a flywheel journaled about said driven shaft, a friction wheel connected with said driven shaft, a clutch disposed between said flywheel and said friction wheel and rotatably engaged for rotating said friction wheel and flywheel as a unit for allspeeds of operation of the rotary shaft below a predetermined speed, centrifugal means carried by said flywheel for longitudinally dis- ;placing said friction wheel with respect to the driven shaft on conditions of excess speed of the rotary shaft for forcing said friction wheel into frictional engagement with a part of said casing forapplying a load to the rotary shaft and spring :means for adjusting the tension on said friction wheel and opposing the action of said centrifugal means.

7. A speed control for a rotary shaft comprising in combination with a frame structure, a rotary shaft rotatably mounted with respect to said fram'e structure, a speed control mechanism ygeared to rotate under control of driving forces imparted by the rotation of said rotaryT shaft, said speed control mechanism including a vertically disposed rotatably mounted driven shaft, a horizontally extending flywheel concentrically Y disposed about said driven shaft, a friction wheel secured to saidI driven shaft and vertically displaceable for establishing frictional engagement with a'xed part of the casing of said speed control mechanism, centrifugally actuated means connected to said flywheel and operative against said friction wheel for bringing said friction wheel into frictional engagement with the fixed casing y of said speed control, and additional means actuated by the momentum of said flywheel and operative against said friction wheel for bringing said friction wheel into frictional engagement with the fixed casing of said speed control.

8. A speed control for a rotary shaft comprising in combination with a frame structure,a rotary shaft rotatably mounted with respect to said frame structure, a speed control mechanism geared to rotate under control ofdriving forces imparted by thel rotation of said rotary shaft, said speed control mechanism including a vertically disposed rotatably mounted driven shaft, a horizontally extending flywheel concentrically disposed about said driven shaft, a friction wheel, a diametrically extending pin projecting through said friction wheel and through a longitudinally disposed diametric slot in said driven shaft, ad-

justable spring means extending through a bore interiorly of said driven shaft and bearing against said pin, and coacting inclined faces carried by said flywheel and said friction wheel and adapted to act under the force of momentum of said ilywheel to displace said friction Wheel along said driven shaft against the action of said adjustable spring for effecting frictional engagement between said friction wheel and a portion of the `casing of said speed control mechanism.

9. A speed control for a rotary shaft comprising a casing,.speed control mechanism disposed within said casing, a rotary shaft, means extending between said shaft and said speed control mechanism for driving said speed control mechanism in accordance with the rate of rotation of said shaft, a frusto-conical friction wheel forming part of said speed control mechanism, a frusto-conical shaped engaging surface projecting from said casing in alignment with said friction wheel and engageable by said friction wheel :for establishing a braking effect upon the rotary shaft, and means operable under conditions of excessive 'rates of variation of speed for producing said braking effect.

10. In a speed control for a rotary shaft, a Y

ingfor effecting .a braking action under conditions `of abnormal deceleration of said driven shaft.

1l. A speed control for a rotary shaft comprising a casing, the rotary shaft journaled in a frame structure, a driven shaft journaled vertically in said casing, means for driving said driven shaft by said rotary shaft from a position exteriorlyI of said casing, a flywheel disposed concentrically around said driven shaft, a friction wheel slidable longitudinally with respect to said driven shaft, clutch faces normally interengaging said flywheel and said friction wheel, a plurality of bell cranks pivoted with respect to said flywheel and extending radially with respect to said flywheel, weights ycarried on the extremities of each of said bell cranks, the opposite ends of said bell cranks extending beneath the periphery of said friction wheel and operating to raise said friction wheel into frictional engagement with a portion of the casing of said speed control, partial disengagement of the clutch faces between said flywheel and saidv friction wheel being caused by deceleration of the driving shaft and also operable to produce a braking action on the driven shaft.

12. A speed control for a rotary shaft comprising a casing, centrifugal mechanism disposed within said casing, drive means exterior of said casing for imparting rotary movement to said centrifugal mechanism within said casing, a friction brake operated by said centrifugal mechanism for controlling the speed of the shaft, and auxiliary control means leffective to instantaneously stop the shaft under conditions of abnormal deceleration.

13. A speed control for a rotary shaft comprising a casing, momentum mechanism disposedA within said casing, drive means exterior of said casing for imparting rotary movement to said momentum mechanism within said casing, and a friction brake operated by said momentum mechanism for stopping said shaft when the speed of the shaft is decelerated at an excessive rate.

V14. A speed control for a rotary shaft comprising a casing, mom'entum and centrifugal mechanism disposed within said casing, drive means exterior of said casing for imparting rotary movement to said momentum and centrifugal mechanisms within said casing, and a friction brake automatically selectively operative by said momentum and centrifugal mechanisms for controlling the speed of the shaft.

l5. A speed control for a rotary shaft comprising in combination with a frame structure, a rotary shaft rotatably ymounted with respect to said frame structure, a speed control mechanism geared to rotate under control of driving forces imparted by the rotation of said rotary shaft, said speed control mechanism including a vertically disposed rotatably mounted driven shaft, a horizontally extending iiywheel concentrically disposed about said driven shaft, a friction Wheel slidably mounted on said driven shaft and rotatable therewith, coacting ratchet teeth on said flywheel and said friction Wheel disposed for normally driving said flywheel through said friction wheel, said ratchet teeth adapted to act under the force of momentum of said flywheel to displace said friction Wheel along said driven shaft for effecting frictional engagement between said friction Wheel and a portion of the casing of said speed control mechanism.

THURLOE M. HAGENBGOK. 

